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Subject: Re: system() return value if no program present
Date: Fri, 01 Oct 2004 12:37:33 +0200
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Eli Zaretskii escribió:
>>>>When executed in my system I find myself in a new shell:
>>>>
>>>>Microsoft Windows XP [Versin 5.1.2600]
>>>>(C) Copyright 1985-2001 Microsoft Corp.
>>>>
>>>>c:\c>
>>>

I have found the same problem in another computer and I have found that 
this only happens when an environment variable "SHELL" is defined. If I 
undefined it, no interactive shell is launched.

set SHELL=
   - system("grep")=2 and works as expected
   - system("notexist")=0 and works as expected ("not found")
   - system("dir")=0 and works as expected

set SHELL=cmd
   - system("grep")=2 and works as expected
   - system("notexist")=-1 and works as expected ("not found")
   - system("dir")=-1 and it does nothing (¿why?)

set SHELL=c:\wtsrv\system32\cmd.exe    (correct path)
   - system("grep")=2 and works as expected
   - system("notexist") runs interactive shell and then returns 0 (¿why?)
     (this was what begun my question)
   - system("dir") runs interactive shell and then returns 0 (¿why?)

Thank you